Who can use contact lenses?

There is no such eligibility criteria for wearing a contact lens, almost everyone can wear it. If you really want to wear it then first of all you should consult a good eye specialist and take some suggestions.

I agree with David, as such there are no criteria to define who can use contact lenses; everyone can use it as per their comfort. However, the person with certain type of vision lacking use to wear contact lenses, but some other persons use to wear it for changing eye color too.
Contact lenses are trendy for both men and women of all ages; you can find their vast range on http://www.contactlensheaven.com/shop-by-brand.html shop. These small things allow users more freedom than glasses and give good comfort while doing day to day activities.